Glazed structures and glazing bars for use in such structures



p 1959 E. D. HINCHLIFFE ETAL I 2,

GLAZED STRUCTURES AND 'GLAZINC BARS FOR USE IN SUCH STRUCTURES FiledJuly 8, 1957 4 Sheets-Sheet 1 4AFRE3Z3. k/ooL 1.5V

Sept. 1, 1959 E. D. HINCHLIFFE ETAL GLAZED STRUCTURES AND GLAZING BARSFOR USE IN SUCH STRUCTURES I 4 Sheets-Sheet 3 Filed July 8, 1957 IGLAZED STRUCTURES AND GLAZING BARS FOR USE IN SUCH STRUCTURES ErnestDarby Hinchliife and Alfred Bernard Woolley, West Bromwich, England,assignors to Hills (West Bromwich) Limited, West Bromwich, EnglandApplication July 8, 1957, Serial No. 670,518 Claims priority,application Great Britain July 13, 1956 16 Claims. (Cl. 20-56) Thisinvention has reference to glazed structures, particularly glazed wallstructures known in the trade as glazed curtain walling, of the kindcomprising a framework which is anchored to and externally of the mainstructure of a building and is constructed from a number of main andauxiliary glazing bars, each of the auxiliary bars being secured to andbetween two adjacent main bars to provide the framework with rectangularopenings each of which is adapted to be closed by a sheet of glass bysupporting and securing the marginal zones of the sheet upon the barsdefining the opening; the invention is further concerned with glazingbars for use in the construction of the said framework.

Herein, the meaning of the term glazed structure is not to be restrictedto structures of the above kind in which all of the openings in theframework are closed by sheets of glass, but is intended to includestructures in which only certain of the said openings are so closed, theremainder being closed either by panels which may be opaque, translucentor transparent, or by windows or ventilators having opening lightsmounted in frames supported by and secured upon the glazing bars.

The principal object of the present invention is to provide an improvedputtyless glazed structure of the kind referred to, which is capable ofbeing erected in minimum time, is weatherproof and permits expansion andcontraction of the glazing bars without detriment to the weatherproofcharacter of the structure.

A further object of the invention is to ensure that all connectionsbetween the glazing bars are concealed from sight so as to enhance theappearance of the structure.

In accordance with the said invention, a glazed structure comprises anumber of parallel main glazing bars to and between which auxiliaryglazing bars are assembled at right angles, each auxiliary bar having,at each end thereof, a tongue which passes through an aperture in alateral wall of one of the main bars and is anchored to the lattter by akeeper plate secured to and between the lateral walls of the said mainbar.

Preferably, the tongue is formed with at least one hole which is engagedby a corresponding peg provided on the keeper plate the said plate beingsecured to threaded studs which are screwed into tapped holes in thecentres of transverse straps located on opposite sides of the aperture,the ends of the straps being located in recesses formed in the internalsurfaces of the walls by inwardly directed flanges on the edges of thesaid walls, and being thrust against the sides of the said recesses byscrewing the studs on to an end wall of the main bar.

Headed nuts screwed upon the fixing studs of additional and identicalstraps secured to and transversely of the bar between the apertures, mayserve as means for assembling a channel section capping strip to andlengthwise of the main bar, by engaging inwardly extending lips on theinternal surfaces of the sides of the said strip under the heads of thenuts so as to grip lateral marginal zones of glazing between resilientcords accommodated in grooves extending along the edgesof the walls ofthe bar and of the sides of the capping strip.

Each auxiliary bar may be of T-section between the tongues at itsopposite ends, and a weather-proofing strip may be secured to the edgeof the stem of the bar by resilient bushes which are disposed aroundbolts engaging tapped holes in the said edge and are compressed betweenthe strip and the crown of a channel section capping strip assembledupon and lengthwise of the bar by the same bolts. The weather-proofingstrip may be provided with two wings which project from opposite sidesof the stem into overlapping relationship with longitudinally groovededges of lateral walls on the head of the bar, one wing engaging thegroove in one of the said edges and the other being trapped between aside of the capping strip and a marginal zone of glazing seated on aresilient cord accommodated in the groove in the other of said edges.

To permit expansion and contraction of the main and auxiliary bars, theholes in the tongues of the auxiliary bars may be of greater diameterthan the pegs on the keeper plate, whereas one end of the main bar maybe moveable in the direction of the length of the bars relatively to themain building structure; for example, the said main bar may comprise abase of hollow box section which is adapted to slide upon aspigot-sleeve socketted into one end of the said base.

In order that the invention may be more readily understood and carriedinto practice, reference will now be made to the accompanying drawings,wherein:

Figure 1 is a perspective view, partly in section, of a joint between avertical bar or mullion and two horizontal bars of transoms, of a glazedcurtain walling.

Figure 2 is an exploded view of the joint, certain parts having beenomitted.

Figure 3 is a section, on an enlarged scale, along the line a--a, Figure1.

Figure 4 is a section along the line b h, Figure 3.

Figure 5 is a section, on the same scale as Figure 3, along the line cc,Figure 1.

Figure 6 is a section, on a still larger scale, along the line dd,Figure 1.

Figure 7 is a vertical section through the adjacent ends of two mainbars used in the erection of a mullion, and

Figure 8 is a section along the line ee, Figure 7.

The joint shown in Figures 1-5 is part of a glazed curtain wallingcomprising any desired number of vertical mullions 1 which are pitchedapart by any predetermined distance, and a number of horizontal transoms2 each of which is connected to and between two adjacent mullions, twoor more transoms being provided between each of the said adjacentmullions at predetermined intervals apart along the length of thelatter. Each of the mullions may be of any desired length and may extendbetween two or more floors of a building, or from the ground level toany floor or the roof eaves of the building as desired; when the lengthof a mullion is in excess of a predetermined maximum, preferably it isbuilt up from two or more sections which are connected end-to-end invertical alignment.

The interconnection of the vertical mullions and horizontal transomsprovides a framework having a number of rectangular openings, and eachopening may be closed by a sheet of glass 3 of which the peripheralzones are supported by mullion portions and transoms defining theopening. Alternatively, as and where desired throughout the framework,certain of the openings may be closed by panels or by opening windows orventilators, the panels and the frames of the windows or ventilatorsbeing supported by the mullions and transoms in the same manner as theglass sheets. i

The framework erected from the assembly of mullions and transonis isadapted 156 be assembled to the main striietiire of a building in anydesired manner, for example, by anchoring each mullion to the saidstructure at, each floor and/or ground and/or roof eaves level. E565vertical n'iiillidr'i or mulliori section comprises a main glazing bar 4which is located on the inside of the Walling so that it is not exposedto weather, and a capstrip 5 which is located on the outside of thewalliiig is exposed to weather, the said bar and strip jiir efeiablyconsisting of aluminum extrusions. The bar 4 is formed with a base ofhollow box-like section, the

wall 6 of the said base adjacent the glazing being wider than itsopposite end wall 7, and the side walls is being relatively inclinedfrom the vicinity of the wider end wall so that the base comprises aroot portion of tiinrofin width and then tapers to the narrower endwall. rheparana sides 6f the root portion extend beyond the wider walland each extension is formed along its fi e edge with aninw a'rdlydirected flange 9 having in edge adjacent the glazing 3, a longitudinalgroove 10 of inverted-V or dovetail section in which a resinbonded orlike resilient cord 11 is accommodated; the said cords project beyondthe flanges so as to provide resilient beds for the internal surfaces ofthe lateral edge zones of the said glazing. By providing the flanges 6nthe sidewall extensions, two longitudinal channels are formed internallyof the said extensions, the said ehannels being disposed mouth-to mouthand being of the same uniform depthand width.

At each position along the main bar at which a .transorn is connected,an aperture 13 is formed in the extension of the corresponding side wall8, the said aperture opening to the flanged edge of the said extensionand reaching to the external surface of the wider end wall '6 (seeFigure 2). When, asshown in the drawings, two transoms located onopposite sides of the main bar are connected to the said bar intransverse alignment, a

pair of identical registering apertures 12 is formed in the extensionsof the side walls 8. I

Each horizontal transom comprises an auxiliary glazing bar 13 and acapping strip 14, each of which also preferably consists of an aluminiumextrusion.

The bar 13 is approximately T-shaped in cross section except that, ateach end thereof, the stem 15 is cut ifrom the head in the samedirection as, and parallel to,

the stem 15, an inturned'flange 19 having a groove 29 in its outersurface, is formed along the -free edge of each of the walls, and anasbestos or similar cord 21 is accommodated in and projects from thegroove 20 which is disposed below the stern so as to provide a resilientbed for the upper-marginal zone of a comefsponding glazing sheet 3. Thetongues 17 seat upon the external surface of the wider walls 6 of themain bars, and the extensions of the side walls 8 are of the same depthas the side walls 18 so that the grooved flanges 9 and 19, and the cords1'1, "21 accommodated therein, are flush with one another and theglazing beds simultaneously on'the said cords. ;A hole 17a is formed ineach tongue 17 in the plane of the stem 15.

To anchor the auxiliary bars to the main bars, metal straps 22 aresecured between the extensions of the side walls 8 on opposite sides ofthe registering pair of apertures 12. The straps are of an overalllengthequal to the distance between the adjacent surfaces of the saidextensions so that their opposite ends extend'respectively into thechannels 1a, abut the said surfaces and are disposed between the saidflanges andthe end wall 6. Since the strap ends abut the wallextensions, -movement of the straps transversely of the main :bar isprevented and therefore tapped holes 23 formed in and centrally of eachof the said straps are located in the longitudinal centre line of thebar. A threaded stud 24 (see Figure 2) is screwed into the centraltapped hole of each strap and on to the external surface of the wall 6,thereby forcing the strap ends against the flanges 9'to lock the strapsto and transversely of the bar; the studs are of a length such that theyproject beyond their respective straps, and the side wall extensions(see Figure 2) so that two holes 26 in a keeper plate 25 may be engagedrespectively with the studs. The width of the keeper plate is equal tothe distance between the adjacent edges of the flanges 9 and twotransversely aligned pegs 27 are provided on and midway between the endsof the said plate; upon engaging the holes 26 with the studs 24, theplate passes between the flanges on opposite sides of the apertures 12and seats upon the straps and the tongues of the auxiliary bars, and thepegs 27 engage respectively with the holes 17a in the said tongues; theplate is then secured in position by screwing nuts 28 on to the studs(see Figure 3). The pegs are of a diameter less than the diameter of theholes 17 so that, although the engagement of the pegs in the holesanchors the auxiliary bars to the main bar, nevertheless the differencebetween the said diameters permits expansion and contraction of theauxiliary bars.

The keeper plate is formed, on each lateral edge thereof, with an ear 29which fits within the corresponding aperture 12,, and is formed with anupstanding lip 30 which is disposed in longitudinal alignment with theouter side of the corresponding longitudinal groove 10 so that the cord11 extends across the said ear in contact with the said lip.

A flashing strip 31 having holes 32 which are pitched apart by the samedistance as the holes in the keeper plate and which also engage thethreaded studs 24, is superimposed and seated upon the said plate by thenuts 28. The lateral edges of the strip are bent out of the plane of thestrip and away from the plate to form longitudinal grooves 33 whichreceive the inner sides of the grooves 10 so that between the apertures12, the free and outer sides of the strip grooves abut the cords 11thereby ensuring that the said cords remain in contact with the lips 30.The grooves terminate short of the upper end 31a of the strip and thisupper end is turned over towards the wall 6 through an angle in excessof ninety degrees (see Figure 3) into contact with the Wall to .providea pocket which is filled with mastic or other waterproof material 34 toensure that any water which may gain access to and flow down the saidwall, "is directed over the strip and is prevented from gaining accessto the underside of the keeper plate from where it could seep throughthe apertures 12 to theinterior of the walling.

To facilitate the engagement of the straps 22 in the channels 1a, eachend of each strap is formed with a portion 22a which is at right anglesto the longitudinal cen'tre'line of the'strap and abuts the internalsurface of the extension of the corresponding wall 8, and a charnferedportion 22b,'the said inclinedportions extending from the oppositelongitudinal edges of the strap.

Having anchored the auxiliary bars of each framework joint tothe-corresponding main bar, a weatherproofing strip 35 of approximateZ-section, and of the same length as the-auxiliary bars, is applied tothe stem 15 of each'auxiliary bar. The saidstrip is formed with'a'channel along the root of one wing 36 and the said channel issocketed onto the =free-edge of the stenrso that the wing 36 andtheother wing 37 project from the opposite sides of and at right angles'to the stem: the

--depth of the channel-is such that the wing 36 is spaced from the cord21 in "the lower channelled flange 19 of the bar by a distancesubstantially equal to the'thickness of the .glazing 3; however, thewing- 37 is level with the *upper flange g19=of the said bar and itsextremityiover- 52 laps the groove in the said upper flange and iscurved so that it enters and seats upon the internal surface of thegroove: a layer 38 of mastic or similar waterproof substance is appliedto the upper face or the strip and the surface of the wing 37 remotefrom the head of the bar. 1

Each sheet of glazing is inserted into the corresponding rectangularopening of the framework by sliding its upper marginal zone between thecord 21 and wing 36 of the weather-proofing strip applied to theauxiliary bar extending across the head of the opening, seating theopposed lateral zones upon the cords 11 of the main bar portionsextending along each side of the opening, and bedding the lower marginalzone in the mastic or like layer 38 on the weatherproofing strip appliedto the auxiliary bar extending across the bottom of the opening, thesheet being retained temporarily in position by clips 39 (see Figure 3)applied to threaded studs 24a whereby additional straps 22c, identicalto the straps 22 are fixed in and transversely of the main bar betweenthe said upper and lower auxiliary bars by headed nuts 40 screwed uponthe said studs and projecting between and beyond the glazing 3 locatedon opposite sides of the mullion.

The fixing of the glazing is made permanent and weatherproof byassemblying the capping strips 5 and 14 to the main and auxiliary barsrespectively.

The capping strip 5 of each mullion is of channel section, its mouthbeing of uniform width for a fraction of the depth of the strip byforming each of the two sides with parallel portions 5a which areperpendicular to the glazing 3, the remaining portions 5b of the saidsides being relatively inclined so that the strip tapers towards itsbase 50. The free edge of each side 5a, 5b is formed with a longitudinaland internal flange 5d having in its outer face an inverted-V ordovetailed groove in which a plastic or like cord 39 is accommodated.The said cord is formed with two diverging wings 39a which are pressedupon the surfaces of the glazing on opposite sides of the mullion andthereby prevent water seeping between the capping strip and the glazing.A lip 52 projects from each flange 5d inwardly of and towards thelongitudinal centre line of the capping strip, the said lip beinginclined towards the base 50 and the two lips terminating at equaldistances: from and on opposite sides of the said centre line. The nuts40 screwed on to the additional threaded studs 24a have tapered heads40a and necks 40b of smaller diameter than the said heads which are of adiameter in excess of the distance between the adjacent edges of theinclined lips 5e. Since the holes 23 in the centres of the straps 220are located in the longitudinal centre line of the main bar, and thelips 5e' are disposed equidistantly from the longitudinal centre line ofthe capping strip 5, the lips will engage and ride over the nut heads40a as the strip is applied to the glass sheets, to centralize the striprelatively to the bar and, as the strip is pressed upon the glazing, thewings 40 of the cords 39 are flexed outwardly and the lips 5e snap underthe nut heads to secure the strip resiliently upon the glazing insymmetrical relationship to the bar.

The horizontal capping strips 14 are also of channel section, are of adepth which is substantially equal to the depth of the mouth portions 5aof the capping strips 5, and are of a length equal to the distancebetween the said mouth portions of strips incorporated in the twoadjacent mullions to which the transoms are anchored. The upper side ofeach horizontal capping strip comprises a downwardly inclined portion14a which extends to the crown 14b of the strip, countersunk holes 14care formed in the said crown at intervals apart equal to the intervalsbetween tapped holes 15a in the edges of the stems 15 and holes 35a inthe base of the channelled portion of the weather-proofing strips 35,in-

:wardly directed lips 14d are formed along the free edges 6", of'bothsides of the strip, and drainage holes114e are formed in and atintervals along the length of the lower side of the strip.

The inverted frusto-conical head 42 of a resilient bush 41 is heldwithin each countersunk hole in the crown of the horizontal cappingstrip, so that the bush is held internally of the strip and abuts theedge of the stem 15 as the strip is applied to the correspondingauxiliary bar. By aligning the bores of the bushes in the capping strip,with the registering holes 15a and 35a in the stem and weatherproofingstrip respectively, bolts 43 may be passed through the said bores, andholes 35a may be screwed into the tapped holes 15a to secure the cappingstrip to the horizontal bar with the ends of the said strip in closeproximity to the flat side portions 5a of the vertical capping strips,with the lip 14d on the upper side of the strip 14 in contact with thelower marginal zone of the glazing sheet 3 secured above the transom,and with the lip 14d on the lower side of said strip in abutment withthe wing 36 of the corresponding weatherproofing strip. By screwing thebolts 43 as far as possible into the tapped holes, the bushes arecompressed and the lips 14d are pressed towards the outer surfaces ofthe glazing 3 thereby restricting any tendency for water flowing downthe outside of the said upper glazing sheet to seep between the surfaceof the upper sheet and the upper side of the strip 14. Nevertheless, anywater which may gain access to the interior of the capping strip isprevented from seeping to the interior of the walling by theweatherproofing strip 35 and mastic or like layer 38, is free to flowthrough the clearance formed between the crown 14b of the strip 14 andthe channelled portion of the strip 35 by the bushes 41, and then bedischarged through the slots Me.

To permit expansion and contraction of the mullions withoutdetrimentally affecting any of the Weathertight seals made in thewalling, the head of each mullion section makes a sliding engagementwith the foot of the next adjacent higher section, and the head of theuppermost section makes sliding engagement with a fixture provided onthe main structure of the building. For example, as shown in Figures 6and 7, the adjacent ends of the main bars of the two adjacent mullionsections are tied respectively by bolts 44 and 45 to a bracket 46 fixedin any convenient manner to the main structure (not shown), and theopposite ends of a spigot-sleeve 47 socket into the adjacent ends of thehollow bases of the said bars. The bolt 44 passes through a slot 48 inand lengthwise of the narrower end wall 7 of the base of the lower bar,and a similar slot 49 in and vertically of the bracket so that the headof the lower bar is capable of sliding relatively to the bracket in adirection along the length of the bar. However, the bolt 45 passesthrough and fits within holes 50, 51 formed respectively in the foot ofthe narrower end wall 7 of the upper bar and the bracket so that thesaid foot is fixed relatively to the bracket end therefore to the mainstructure of the building.

A somewhat similar connection is effected between the capping strips 5of the two aligned mullion sections by a tapered channel section spigot52 which fits within and is retained resiliently within the adjacentends of the said strips; relative longitudinal movement between thespigot 52 and the strips is limited by providing the said spigot with anose 53 which projects into the clearance between the crowns of the saidstrips.

A flashing strip 54, similar to the flashing strip 31, is assembled tothe foot of the upper bar, by engaging two holes therein with thethreaded studs 24a securing two additional straps 220 against theflanges 9 of the said foot, and securing the said strip upon the saidstuds by taper-headed nuts 40. The strip 54 extends between the flanges9 of the head of the lower bar but is not secured to the said head whichis therefore free to slide relatively to the said strip when the bar isexpanding or contracting. The upper end 54a of the flashing strip '54 isbent over into contact with the external surface of the wider end wall 6of the upper bar and is sealed with a layer 54b of mastic or likewaterproof substance, whereas the lower end 540 of the strip is bentover through an angle less than ninety degrees into contact with thewall 6 of the lower bar so that any water flowing down the wall 6 of theupper bar is conducted on to, and flows down, the flashing strip on tothe wall 6 of the lower bar and is prevented from gaining access to theclearance between the adjacent ends of the two bars.

The head of the uppermost section of each mullion is socketed in to andmakes sliding engagement with a spigot sleeve (not shown), similar tothe sleeve .47, depending from a bracket fixed to the main structure atthe top of the walling.

In the joint shown in Figures 1-5, two aligned and horizontal transomsare anchored to the vertical mullion; however, in some of the joints(not shown) of the framework a single transom only is connected to amullion; in such joints, the main bar is formed with a single aperture12 to receive the tongue 17 of the transom bar 13 and the keeper plate25 is formed with a single lipped car 29 which fits within the aperture;otherwise, the joint is effected in the same way as the joint shown inthe said Figures l-5.

If desired, instead of producing each main bar 4 in one piece, the widerend wall 6 and the extensions of the side walls 8 may form one unit andthe said side walls and the nanrower end wall 7 may form a second unit,the said first unit being provided with parallel lateral lips whichsocket into the mouth of and are bolted or otherwise assembled to thesecond unit. Such a construction permits the cross section and,therefore the strength, of the bar to be varied by replacing the secondunit by an alternative unit having-diiferent cross sectional dimensions.

What we claim is:

1. A glazed structure wherein auxiliary glazing bars are assembled toand between and at right angles to a number of parallel main glazingbars, a plurality of apertures in a lateral wall of one of the mainbars, a keeper plate, each auxiliary bar having, at each end thereof, atongue which passes through one of said aper- 'tures in the lateral wallof one of the main bars and is anchored to the latter by said keeperplate secured to and between the lateral walls of the said main bar.

2. A glazed structure as claimed in claim 1 wherein each tongue of theauxiliary bar is formed with at least one hole which is engaged by a pegon the keeper plate.

3. A glazed structure as claimed in claim 1 wherein the keeper plate isfixed upon the main bar by threaded studs which pass through holes inthe plate into engage ment with straps locked to and transversely of thewalls of the said bar on opposite sides of the aperture, and

by nuts screwed on to the said studs.

4. A glazed structure as claimed in claim 1 wherein the main bar isprovided with lateral and coextensive lateral Walls in each of which anumber of tongue- "receiving apertures is formed, the internal surfaceof each wall having recess therein on the opposite sides of eachaperture, the corresponding recesses on each side of each aperture beingengaged by the opposite ends of a strap having a tapped hole in thecentre thereof, the

said hole being engaged by a threaded stud which is screwed down on tothe bar to force the strap ends gagainst'the edges of the recessesremote from the bar,

and-a plate disposed between the said walls and having at 'leastone pegwhich engages a hole in the tongue of an auxiliary bar insertedthroughthe aperture, :being fixed Ito the strap securing studs on oppositesides of the :aperture.

5. A 'glazedt structure :as claimed in claim 4, wherein "theirecessesconsist of channels which, initially, are co- 8. extensive withthe barwalls but are interrupted by the formation of the tongue-receivingapertures.

,6. A-glazed'strueture as claimed in claim 4, wherein from the bar withan inwardly directed flange to which each .of the bar walls is providedalong its edge remote each aperture in the said Wall opens, and whichhas a groove in and extending lengthwise of its outer surface, the platefits within the clearance between the two flanges and has, on at leastone edge thereof, a laterally projecting ear which fits within acorresponding one of the apertures with its face remote from the barflush with the base of the groove, the said car being provided with alip which is in longitudinal alignment with the outer side of the grooveso that .a resilient cord accommodated in the groove and spanning theaperture, contacts the inner face of the lip.

7. A glazed structure as claimed in .Claim 6 wherein a flashing stripengages the strapsecuring studs and seats upon the face of the plateremote from the main bar, the lateral edges of the said strip beingformed into grooves of which the outer. sides engage the cord-acco dmodating grooves in the flanges so that one of the said outer sidesspans the lipped ear in contact with the side of the corresponding cordopposite to the lip, and wherein at least one end of the strip projectsbeyond the plate and is turned over towards the bar through an anglegreater than ninety degrees and contacts the said bar.

8. A glazed structure as claimed in claim .3 wherein additional strapsare fixed to and transversely of the sides ofthe main bar between theapertures, by threaded studs bearing upon the bar and projecting awayfrom the bar beyond the straps, headed nuts screwed on to the saidprojections being engaged by inwardly directed lips provided on andinternally of the sides of a capping strip extending lengthwise of thebar, to attach the said strip to the bar.

9. A glazed structure as claimed in claim 8, wherein the free edge ofeach side of the capping strip is grooved longitudinally thereof and aresilient cord is accommodated within and along the length of eachgroove so that a marginal zone of glazing inserted between one of theflanges and a corresponding side of the capping strip, is grippedbetween the cords in the said flange and side respectively.

1.0. A glazedstructure as claimed in claim 2 wherein the peg on theplate -is of smaller diameter than that of the hole in the tongue topermit relative movement between the tongue and plate due to expansionand contraction of the awdliary bar.

11. A glazed structure as claimed in claim 1 wherein one end of thevmainbar is anchored relatively to a main structure to which the g azedstructure is assembled and the Opposite end of the bar is moveable inthe direction of the length of the said bar, relatively to the said mainstructure due to expansion and contraction of the bar.

12. A glazed structure as claimed in claim '1 1, wherein the main barcomprises at least two aligned sections, one of the adjacent ends of thetwo sections ,is fixed and the other of said ends is slideahlerelatively to the main structure, both ends being socketed on to acommon spigot, and being spanned by a flashing strip which extendsbetween the lateral walls of both sections, has longitudinally groovelateraledges which engage grooves formed in and longitudinally of theedges of said walls and is fixed to one of the said adjacent ends.

13. vA glazed structure as claimed in claim 1, wherein each auxiliarybar is of T-section between the two end tongues, the edges of'the headof the bar is provided with walls which project therefrorn on oppositesides of, in the same direction as, and parallel to the stem of the bar,each of the said :walls having a grooveformed 'in and longitudinally ofits edge and one of the said grooves accommodating :a resilientcordwhich is co-planar with cords accommodated in longitudinal groovesin the edges of the walls of the main bar.

14. A glazed structure as claimed in claim 13 wherein a weather-proofingstrip of Z-section extends lengthwise of each auxiliary bar between twoadjacent main bars, the wings of the said strip extending to oppositesides of the stem with one wing overlapping and spaced from the cordaccommodated in the one wall and the other wing overlapping andcontacting the grooved edge of the other Wall of the said bar.

15. A glazed structure as claimed in claim 14, wherein theweatherproofing strip is secured to the stern of the auxiliary bar bybolts passing through the crown of a channel section capping strip intoengagement with 10 tapped holes in the edge of the stem, and byresilient bushes disposed around the bolts between the said crown andstem, the said bolts also securing the said strip to the bar.

16. A glazed structure as claimed in claim 1, wherein each main barcomprises a hollow box-like section base from each end of one wall ofwhich the apertured walls project at right angles.

References Cited in the tile of this patent UNITED STATES PATENTS

